This is a great list that ranks 30 DC Universe movies (click here). And I agree, for the most part with the rankings with only a couple of exceptions.
First, let me be clear, I love all of these movies. Why?
A) I'm a fan boy and I love the entire superhero genre. Now, don't get me wrong, I know there are various levels of "camp" that some people like more than others. And some of these are long on camp (Steel), but I don't mind some campy action. Not one bit :)
B) I don't like trashing other creators' work. These are all labors of love, just like my own stuff and I would hate to land on a list of hated works. I like to labor under the notion that people out there "get me" and my art. So based on that same thought, I don't view everything as "good" or "bad" based solely on how much I enjoy it. Though I enjoy movies that other people just loathe. I always look for the gems amongst a few weeds.

So, my thoughts on the list itself? I am so happy to see "Watchmen" listed so high! I love "Watchmen"!
I would personally put "Suicide Squad" much higher. I love that movie so much!
I might bump "Batman vs. Superman" a little higher as well, and "The Losers"...I love that movie. I know it bombed, but I just love it, and I do know the reference material...I possess more than a few vintage "Losers" comics (both the original and the Vertigo re-imagining).